Window-lift device for motor vehicles with a connector means for attaching a window panel to a drive element

ABSTRACT

A window-lift device for motor vehicles with a connector means for attaching the window panel to a drive element comprises a panel-connector, a drive-connector being attached or attachable to the drive mechanism of the window-lift device for lifting and lowering the window panes, matching fixing pieces for fixing the panel-connector to the drive-connector, and further comprises an assembly piece. The assembly piece being mounted to the drive-connector and carrying or supporting a first one of the matching fixing pieces in a pre-assembly position. The assembly piece and the drive-connector together provide a feeding opening for the panel-connector for finding an aligning position in which the matching fixing pieces may be activated to fix or to pre-fix the panel-connector to the drive-connector.

FIELD OF THE INVENTION

[0001] The invention concerns a window-lift device for motor vehicles with a connector means for attaching a window panel to a drive element.

[0002] Window-lift devices in motor vehicles are used in vehicle for doors as well as for liftable/lowerable widow panels in fixed, i.e. none movable, body parts of the motor vehicle.

BACKGROUND OF THE INVENTION

[0003] For window-lift devices in motor vehicles (window regulators) it becomes more and more common to attach the whole window regulator and eventually other electrical or mechanical functional components, like loudspeakers, latches etc. to a door module plate first and to connect this door module plate with all functional components in one step to the vehicle door of the fixed vehicle body part. As some wetness entering along the lower rim of the window opening with moveable window panels is unavoidable, said module plate is also used as a division between a wet and dry space. After the vehicle door or the vehicle body part and the module plate are assembled, the access to the wet space is rather limited—if any. Therefore, inserting the window panel through a slit at the lower rim of the window opening and attaching the window panel to its drive element being placed in the wet space, eventually cannot be controlled by the worker visually. Further, the window panel sometimes needs to be adjusted with respect to the window opening or with respect to other vehicle body parts, like the B-column, after attachment of the window panel to its drive element. This adjustment, again, takes place in the wet space and must be effected despite the limited access to said space as mentioned above.

[0004] The German laid open document DE 198 60 745 A1 (corresponding to U.S. Pat. No. 6,119,403) discloses a connector means for attaching the window panel to a drive element of a window-lift device for a motor vehicle comprising a panel-connector and a drive-connector, both containing matching connecting areas allowing to connect the panel-connector and the panel being attached thereto with the drive-connector being attached to the window regulator like to a rail or the like. The panel-connector is pushed onto the lower edge region of the window panel using a U-shaped glass-channel in a clamping manner. The drive-connector is connected to the guiding and lifting/lowering means of the window regulator. For assembling the window panel to the window regulator, the window panel is slid through the window panel slit under a small angel with respect to the finally aligned window panel position. When the panel-connector reaches the drive-connector and abuts on the upper connecting area thereof, the window panel is tilted to its aligned position, whereby lower connecting areas of the panel-connector and, respectively, the drive-connector are snap connected. This connecting method is considered to be possible without visual contact of the worker. This connector means affords very precise pre-positioning of the drive-connector and correct position of the panel-connector in relation to the drive-connector as the tilting/clip-connecting location must be found without visual control. An adjustment of the correct position of the window panel in X direction of the motor vehicle may be difficult with this type of connector means.

[0005] The German public open document DE 28 36 038 A1 disclosed another connector means for attaching the window panel to a drive element in a window-lift device for motor vehicles using a panel-connector with a glass-channel and a tongue-like connector piece being insertable into a feeding opening of the drive-connector having declining catching planes. When the tongue-like connector piece of the panel-connector reaches the bottom of the declining catching plane, a deflectable locking portion of the drive-connector snaps into a catching hole of the tongue-like connector piece of the panel-connector thereby interconnecting the panel-connector to the drive-connector. Again, this type of connector piece needs quite exact positioning of the panel-connector to find the locking position which is difficult to be achieved without visual control of the worker. Again, an adjustment of the window panel after its connection to the window panel drive is hardly to be achieved with this type of connector means.

[0006] The German laid open document 196 53 046 A1 (corresponding to U.S. Pat. No. 6,205,711 B1) discloses a connector means for attaching a window panel to the drive element in a window-lift device for motor vehicles using a panel-connector with a glass-channel and a tongue-like connector piece, the connector piece including a protrusion and the drive-connector comprising declining catching planes for said protrusion with a horizontally extending channel at the lower end of the declining catching planes for receiving said protrusion and being used (together with the protrusion) as a locking device allowing a horizontal movement of the panel-connector in relation to the drive-connector in the X-direction of the motor vehicle. A snap locking device being foreseen between the panel-connector and the drive-connector allows for one-way movement only, finding the final position of the window panel and locking the opposite direction. While this connector means allows some adjustment of the window panel after being connected to the drive element, this adjustment is only possible in one direction and it's not possible to return back to a former position when the panel-connector has once overridden the former position. Also, while this prior art connector means is foreseen for so-called blind assembling, i.e. with no visual control of the worker, it still needs some skill to find the connecting position. This type of connector means is intended to be used only in particular applications, where the window panel sufficiently can be moved within its final plane, i.e. in the X-direction, when the window is first placed in the right or left side of the vehicle body.

[0007] All prior art examples referred to here-above are foreseen for tool-less assembling and connecting and not foreseen for being releasable or for panel adjustment in both horizontal directions.

[0008] While the WO document 00/03111 discloses a releasable connector means for attaching the window panel to a drive element in a window-lift device for motor vehicles, this connector means does not comprise a panel-connector but only a hole drilled in the lower rim of the glass panel to receive a screwing nut and a fixing screw. This connector means needs visual control of the worker to find the exact positions of the holes in the window glass and is not foreseen for lateral adjustment of the window panel.

SUMMARY OF THE INVENTION

[0009] Starting from here, it's a primary object of this invention to simplify the assembling action of the window panel and the window-lift device of a motor vehicle, particularly for applications where visual assembling control by the worker is difficult or impossible.

[0010] It is another object of this invention to allow adjustment of the window panel after being assembled with the window-lift device, particularly without the need of other parts than those of the connector means itself. It is yet another object of the invention to provide for connector means in a window regulator for attaching the window panel to the drive element which is simple to be manufactured but strongly built.

[0011] According to this invention, a window-lift device for motor vehicles with a connector means for attaching the window panel to a drive element comprises a panel-connector, particularly a panel-connector having a glass-channel and a tongue-like connector piece; a drive-connector being attached or attachable to the drive mechanism of the window-lift device for lifting and lowering the window panel, particularly using at least one rail; matching fixing pieces, particularly for releasably fixing the panel-connector to the drive-connector, like a screw and a screw nut; and further comprising an assembly piece, said assembly piece being mounted to the drive-connector and carrying or supporting a first one of said matching fixing pieces in a pre-assembly position, said assembly piece and said drive-connector together providing a feeding opening for the panel-connector for finding an aligning position in which the matching fixing pieces may be activated to fix or to pre-fix the panel-connector to the drive-connector, particularly before a lateral adjustment action of the window panel is effected.

[0012] By using the assembly piece being mountable to the drive-connector, carrying a first fixing piece and providing a feeding opening according to this invention, it's very easy for the panel-connector to find its final fixing position and to use standard fixing means like screws and screw nuts which allow for subsequent adjustment of the lateral window panel position, no complicated molded type of panel-connectors and drive-connectors being necessary. Instead, very strong and easy to produce panel-connectors and drive-connectors, like extruded or continuous casted metal profiles may be used which can be cut to the length needed for a particular window situation.

[0013] While even the assembly piece may be made from an extruded profile, it advantageously will be a very simple molded plastic part made from recycling material, because, after assembly has taken place and the drive-connector and the panel-connector are fixed together by the matching fixing pieces, the assembly piece has no further function and forms a “lost part”.

[0014] While the second of the two matching fixing pieces may be attached to the connector means in various ways, according to a preferred embodiment of the invention, the second fixing piece is attached to the panel-connector in a way which allows its being catched by the assembly piece when feeding the window panel with the panel-connector to the drive-connector to automatically find its aligning position with the first of the two matching fixing pieces. Thereby, the assembly piece allows for complete “blind” assembly and automatically finding the aligned fixing position.

[0015] According to a yet further embodiment of this invention, the assembly piece is mounted to the drive-connector in a moveable way, like by pushing along a guidance formed on or by the drive-connector. This allow to adjust the window panel to its final position using only the connector means and avoiding additional parts. Adjustment is effected by only pre-fixing the two matching fixing pieces so as to connect the panel-connector to the drive-connector in a way where they can still be moved one relatively to the other to find the correct window panel position and thereafter definitely fixing the panel-connector to the drive-connector by the matching fixing pieces.

[0016] The aforementioned as well as claimed components described in the embodiment and to be used according to the invention, are not subject to any particular exceptional circumstances with respect to their size, design, material selection and technical conception, such that the selection criteria known in a respective field of application may find unlimited use in the scope of the claims.

[0017] Additional details, features and advantages of the object of the invention may be deduced from the following description of the associate figures representing an example of a preferred embodiment as well as from the subclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018]FIG. 1 shows a perspective view of a connector means for attaching a window panel to a drive element in a window-lift device for motor vehicles with the window panel being depicted in part only and the connector means being in its pre-fixed position before the final fixing position is reached—as seen from the vehicle outside;

[0019]FIG. 2 shows the same embodiment as FIG. 1 in a sectional view along line II-II of FIG. 1 with the connector means being in its pre-fixed position before the final fixing position is reached;

[0020]FIG. 3 shows the same embodiment as in FIGS. 1 and 2 in a sectional view along line II-II of FIG. 1 and with the connector means being in its final fixed position.

[0021]FIG. 4 shows the same embodiment of the connector means shown in FIGS. 1 to 3 in a perspective view as seen from the inside of a motor vehicle with the window panel shown in part only and the connector means being in its pre-fixed position before the final fixing position is reached;

[0022]FIG. 5 shows from the embodiment according to FIGS. 1 to 4 a perspective view of an assembly piece (assembly clip) with a fixing screw held in a pre-assembled position for alignment with a matching screw nut (not shown);

[0023]FIG. 6A/B shows the same embodiment of the connector means shown in FIGS. 1 to 4 in a side elevation as seen from the vehicle outside (FIG. 6A) and in a vertical section (FIG. 6B) in a sectional view along line VIB-VIB of FIG. 6A; in both, the panel-connector being in a finding position during the insertion action of the window panel into the drive-connector, where the panel-connector starts to find its final fixing position but has not yet reached the same.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

[0024] As shown in FIGS. 1 to 4 and 6, a connector means 100 of the subject invention composes four individual pieces only; A panel-connector 3, a drive-connector 2, an assembly clip 4 and a pair of fixing pieces 8 and 10.

[0025] The panel-connector 3 has a shape which is known in general from German laid open document DE 28 36 038 A1 as mentioned above, i.e. it consists of a so-called glass-channel 3 a which glass-channel forms a U in cross section to receive a window panel 1 at its lower edge portion in a clamping manner between the two U-flanges and the edge of the window panel normally abutting inside the glass-channel on its bottom. From one of the two flanges of the glass-channel 3 a, a tongue-like connector piece 3 b is extending in parallel but opposite in direction with respect to the neighbored U-flange. The tongue-like connector piece 3 b is provided with a step-like portion 11 for acting as a blocking element for receiving the drive-connector in a blocking manner in which upwardly and downwardly directed forces on one of the two pieces (panel-connector and drive-connector) are transmitted without loading any force to the matching fixing pieces to be explained later. This step-like portion 11 forms a step in parallel to the glass-channel 3 a. Finally the panel-connector comprises a second one of two matching fixing pieces. In the embodiment shown, the second fixing piece is a screw nut 10 being fixed to the lower part of the tongue-like connector piece 3 b, i.e. being located below with a step-like portion 11 and fixed in alignment with a hole 13 through the lower portion of the tongue-like connector piece 3 b, for instance by a press fixing action. However, it is obvious to any person skilled in the art, that the second fixing piece can be integrally included to the panel-connector, if the second fixing piece has threads for receiving a screw. For instance, said hole 13 may have a screw thread. However, the screw nut shown in the embodiment which Is fixed to the panel-connector has the advantage of free choice of material which may be different from Aid the material of the panel-connector and also has further advantages which will become clear herein later.

[0026] The drive-connector 2 consists of a C-shaped profile 2 a and a fixing profile 2 b suspending therefrom and extending in parallel to and downward from the back portion 2 f of the C-shaped profile 2 a. At the transition from the C-shaped profile 2 a to the fixing profile 2 b a step-like portion 12 is foreseen in order to act as a blocking element in connection with the step-like portion 11 of the panel-connector 3 as described here-above. To improve said blocking function, the outer shape of the Cshaped profile 2 a matches with the outside shape of the upper part of the tongue-like connector piece 3 b including the step-like portion 11 and the lower end of the glass-channel 3 a so that the C-shaped profile 2 a can be received in some kind of recess formed by the outside bottom surface of the glass-channel 3 a; the outside surface of back portion 2 f may abut against the upper portion of the tongue-like connector piece 3 b and the step-like portion 12 may abut against the step-like portion 11 of the panel-connector, all surfaces being flat and abutting on flat surfaces of the other part. Finally, the fixing profile 2 b of the drive-connector 2 may abut against the lower portion of the tongue-like connector piece 3 b which extends beyond the corresponding blocking element in form of the step-like portions 11 and 12 respectively. The fixing profile 2 b contains at least one hole 9 for receiving said first fixing piece 8 in aligned position to the second fixing piece 10. The size of this hole 9, which eventually may be a recess in the fixing profile 2 b as well, allows some lateral play of the fixing piece so that the final relative position between the drive-connector and the panel-connector may be adjusted with respect to each other. To allow more adjustment space for the window panel, this play is chosen large enough to each side of a centered position being shown in the drawings. This can for instance be reached, if hole 9 is shaped as an oblong hole as indicated in dashed lines as an alternative. This ability of an adjustment movement of the drive-connector with respect to the panel-connector is depicted by double arrows A in FIGS. 1 and 4 and will be explained here-below in some more detail.

[0027] The fixing profile 2 b of the drive-connector further comprises an inverted T-shaped flange or rail portion 2 d at its lower edge for the receiving and mounting the assembly clip thereupon as explained here-below.

[0028] Before explaining the mounting clip, it should be noted that the panel-connector 3 and the drive-connector 2 preferably are cut from elongated shaped profiles which may be made of any suitable material but preferably of metal profiles, like profiles made of aluminum or aluminum alloys which may be shaped by a well known profile extruding or continuous casting process. This has three major advantages. First, production is very simple and only a few machining actions are necessary, i.e. cutting in length and cutting holes or recesses and, eventually, press fixing a screw nut aligned with the hole 13 in the panel-connector 3. The second advantage of the rail-like overall shape of the drive-connector and the panel-connector lies in the ability to transfer considerable forces between both of the rails by form closure only. Due to their shape and material election the profiles mush be strong enough to transfer such forces without loading the fixing pieces with such forces and without the need of high surface pressure. The third advantage of the rail-like overall shape of the panel-connector and the drive-connector is, that they can be moved parallel to the window pane relatively to each other in a guided manner which allows lateral adjustment of the window panel before screwing down the matching fixing pieces. This overall rail-like structure also allows the use of the same profiles for different window shapes and also locating the connector means in any pre-determined location along the lower edge portion of the window panel.

[0029] Also, the rail-like overall shape of the drive-connector may be advantageous when used in connection with various kinds of window regulator types. Particularly, the C-shaped profile 2 a may be used for receiving a roller or a link block of a window regulator arm in a rolling or sliding manner. Finally, the overall rail-like shape of the drive-connector allows to receive the assembly clip in a moveable guided manner which will be explained in some more detail here-below.

[0030] As may be seen from all figures and particularly from FIG. 5, the assembly clip 4 may have a rather complex shape but it can easily be made by a molding process which is common for injection molding production of plastic parts.

[0031] However, it should be noted, that the assembly clip—in general—may be manufactured in an extruded or continuous casting process as well and cut into lengths and machined thereafter for receiving the matching fixing pieces in an aligned manner. However, one piece molding normally will be cheaper, because the assembly clip is an assembly aid only, with no considerable function after assembly of the connector means when the relative adjustment and fixing of the panel-connector to the drive-connector one has been finished.

[0032] In the preferred embodiment, the assembly clip is over all U-shaped and having first and second flange portions 4 a and 4 b and a relatively wide bottom portion 4 d there between. The bottom portion having a grove like recess 4 e being accessible from the inside bottom and extending along the whole length of the assembly clip at a right angle to the U-shape cross section of the assembly clip. The assembly clip may have reinforcing fins to strengthen the assembly clip while using thin material dimensions in general.

[0033] In the middle of the first flange portion 4 a a pre assembly portion for receiving and carrying a first fixing piece is foreseen. In the shown embodiment, a collar around a circular hole 7 allows to carry the cylindrical head 8a of a fixing screw acting as said first fixing piece in a slightly clamping manner so as to hold said fixing screw in a pre-assembled aligned manner without losing the fixing screw while handling the assembly clip as being described herein later said collar being spaces at a lateral distance from the drive-connector 2 to allow for receiving a threaded bolt portion therein.

[0034] The opposite (second) flange portion 4 b comprises declining catching planes 4 c around a position 4 g (aligning portion) being opposite to the circular hole 7 in the first flange portion 4 a. In the preferred embodiment, the declining catching planes are symmetrically placed on each side of the aligning location of fixing screw 8. Each of the two declining catching planes 4 c comprise sub-planes 4 c′ and 4 c″, said sub-planes 4 c′ diverting upward/outside from the second flange portion 4 b and the sub-planes 4 c″ forming a V-shaped recess being formed in the second flange portion 4 b starting from its upper edge to decline to the aligning portion 4 g of the matching fixing pieces within the second flange portion 4 b of the assembly clip 4.

[0035] The operation of the connector means of the embodiment shown in FIGS. 1 to 6 will become apparent from the following:

[0036] Starting from the assembly clip 4 in FIG. 5, this assembly clip, bearing a first fixing piece 8, is mounted to the drive-connector 2 by pushing the grove-like recess 4 e of the mounting clip over the rail portion 4 d of the drive-connector the shape of which is matching with the grove-like recess 4 e to receive the assembly clip 4 in a guided slideable manner. During this action, the threaded bolt portion 8 b of fixing screw 8 ends at small distance before one of the opposing surfaces of the fixing profile 2 b which allows the assembly clip to be pushed on to and slid along the drive-connector without obstruction.

[0037] When the assembly clip has reached the alignment area of the drive-connector 2, the hole 9 in fixing profile 2 b of the drive-connector 2 will be in aligmnent with threaded bolt portion 8 b of screw 8 allowing to push screw 8 a little forward so that the front end of the threaded bolt portion 8 b enters into said hole 9. This will hinder the assembly clip 4 to be pushed any further along the drive-connector 2 except as far as the lateral movement allowed by the lateral play between the threaded bolt portion 8 b and hole 9 along the sliding direction of rail portion 2 d and grove-like recess 4 e. This situation may be seen best from FIGS. 5B and 2.

[0038] Now, the drive-connector is ready for receiving the panel-connector 3 which is described herebelow. However, this assembly action is effected only after the drive-connector has been assembled to any type of convenient window regulator known in the art and not described herein therefore. Also, the whole window regulator and drive-connector will be assembled with the vehicle door or a body portion of the vehicle, eventually and preferably using a module sheet as described herein with respect to well known prior art.

[0039] When inserting the window panel through a window panel slit in the lower edge of a window opening of the vehicle (not shown in the drawing because not forming part of the invention) the panel-connector 3 will automatically approach the overall position of the drive-connector 2. As shown in FIGS. 5A and 5B, it is not necessary to exactly meet the aligning position at once, because the panel-connector will find its way to the aligning position automatically even if the panel-connector will approach to the drive-connector with a horizontal offset in even two directions. This becomes possible first by a feeding opening 6 formed between the outer (vertical) surface of the drive-connector 2 and the (inner) surface of the second flange portion 4 b of the mounting clip 4. The declining catching planes 4 c will support the tongue-like connector piece 3 b of the channel-connector 3 to find its way. First, sub-planes 4 c′ allow, that the lower edge of the tongue-like connector piece 3 b will find its final position close to the outer surface of the drive-connector so that the inner surface of the panel-connector, which is to abut in a parallel flat and matching manner with the outer surface of the drive-connector, will approach and close the lateral gap between drive-connector and panel-connector the more the panel-connector approaches from above to its final position. The second sub-planes 4 c″ will catch the protrusion 10A at the lower portion of the tongue-like connector piece 3 b of the panel-connector at the outer circumference of said screw nut 10 forming said second fixing piece. This catching action itself is known from German laid open document 196 53 046 A1 as described above and being known therefrom.

[0040] At the end of said position finding action, the outer bottom surface of glass-channel 3 a will abut on the outer surface of the upper flange portion 2 e of drive-connector 2 as shown in FIG. 2. The opposing side surfaces of the tongue-like connector piece 3 b and the drive-connector 2 will be still apart from each other due to the matching portions 12 and 11 mentinoed hereabove which becomes apparent from FIG. 2. Now, drive-connector and panel-connector are in aligned position, as the second fixing piece has found its alignment position within aligning portion 4 g of the assembly clip 4 and screw 8 may be drilled from inside the vehicle—eventually through an aligned hole in the module sheet which may be closed in water tight manner later.

[0041] Shortly before screw 8 reaches its final fixing position shown in FIG. 3, the panel-connector and the drive-connector will approach each other to close the lateral gab described here-above due to the action of the first and second matching fixing pieces (screw 8 and thread 10), thereby bringing a C-shaped profile 2 a of drive-connector 2 into its matching position within the recess formed in panel-connector 3 so that the matching step-like portions 11 and 12 abut on each other.

[0042] Before screw 8 is tightened, there is still some movement left possible between panel-connector and drive-connector in A-directions which allows to adjust the window panel to be adjusted, for instance with respect to the B-column of the vehicle, i.e. in X-direction. It is to be noted, that in this phase of the assembly/connecting action, the mounting clip has terminated its function and forms a lost part which is held by rail portion 2 d of the drive-connector only. In this phase even the first and second matching fixing pieces only have the function of applying some pressing force between drive-connector and panel-connector; however, any vertical forces (in Z-direction) and horizontal forces (in X-direction) are transferred between the matching portions of the drive- and panel-connectors only.

[0043] When the final adjustment position has been found, screw 8 is tightened for fixing the adjustment position. Obviously, the actions mentioned before may be reversed, for instance for removing the window panel or eventual future adjustment actions if necessary. 

What is claimed:
 1. A window-lift device for motor vehicles with a connector means for attaching a window panel to a drive element comprises a panel-connector, a drive-connector being attached or attachable to the drive mechanism of the window-lift for lifting and lowering the window panel, matching fixing pieces for fixing the panel-connector to the drive-connector, and further comprises an assembly piece, said assembly piece being mounted to the drive-connector and carrying or supporting a first one of said matching fixing pieces in a pre-assembly position, said assembly piece and said drive-connector together providing a feeding opening for the panel-connector for finding an aligning position in which the matching fixing pieces may be activated to fix or to pre-fix the panel-connector to the drive-connector.
 2. A window-lift device according to claim 1, wherein said assembly piece is a molded part.
 3. A window-lift device according to claim 1, wherein said assembly piece is mounted to the drive-connector in a moveable way.
 4. A window-lift device according to claim 1, wherein said assembly piece is provided for receiving matching fixing pieces in an aligned manner.
 5. A window-lift device according to claim 1, wherein said assembly piece comprises a bearing portion, for receiving and carrying a first fixing piece in a pre-assembled position.
 6. A window-lift device according to claim 1, wherein said assembly piece provides a first flange portion for receiving a first one fixing device in a pre-assembled manner, said first flange portion being spaced at a lateral distance from said drive-connector to allow for receiving a threaded bolt portion within said distance.
 7. A window-lift device according to claim 1, wherein said assembly piece provides a grove-like recess within a portion for being slidingly mountable to a matching rail portion being provided at the drive-connector.
 8. A window-lift device according to claim 1, wherein said assembly piece has an overall U-shaped cross section.
 9. A window-lift device according to claim 1, wherein a second one of said fixing pieces is attached to the panel-connector in a way, which allows said second one of said fixing pieces to be caught by the assembly piece when feeding the window panel with the panel-connector to the drive-connector, to automatically find its aligning position with a first one for said two matching fixing pieces.
 10. A window-lift device according to claim 1, wherein the panel-connector or the drive-connector or both are extruded or continuous casted profiles being cut to the length needed.
 11. A window-lift device according to claim 1, wherein the panel-connector or the drive-connector or both are continuous casted profiles being cut to the length needed.
 12. A window-lift device according to claim 1, wherein the panel-connector and the drive-connector have contact areas with matching shapes acting as blocking means when both are fixed together.
 13. A window-lift device according to claim 12, wherein said matching areas include a C-shaped contour.
 14. A window-lift device according to claim 1, wherein said assembly piece provides declining catching planes for automatically feeding said panel-connector to its fixing position being aligned with said matching fixing pieces being received in said assembly piece. 